This is a showcase on the different types of tempo changers. The effect that is trying to be achieved is 2x slower music. Click the boxes to listen to the effect the method above it has. Click the green flag or stop sign to stop playing the sounds. Description of the types Generic: A very simple method by duplicating every little bit of the sound and blending it. It makes sounds very echoey and almost always duplicates beats. This is a built-in plugin in Audacity. This is only suitable for simple tone sounds. AM: Somewhat made by me. This was done by decreasing the sound's rate/speed and applying an AM pitch shifter. It's the same concept as generic but blends it as a sine wave. Doesn't duplicate beats as often but can cause some distortion in noisy sounds and slightly affect pitch. This might not be very suitable for anything. Paulstretch: This is mainly used for extreme cases. I'm not sure how it works. I used a time resolution of 0.1. This is a built-in plugin in Audacity. A small time resolution can cause distortion. This is only suitable for extreme stretching or noisy sounds. SBSMS: Stands for Subband Sinusoidal Modeling Synthesis. A very complex and high quality time stretcher. It takes much longer to process than the other methods, but the result is very accurate and never skips a beat, but is extremely sensitive to distortion. Don't push it too far or it will sound awful. This is suitable for almost everything, but mostly instruments. Full information about SBSMS can be found on sbsms.sourceforge.net (this website is completely safe).
Just a really quick project I wanted to make. First 4 test subjects were Half-Life soundtracks. I trimmed them so you don't have to listen to the whole thing. The last test subject was taken from the SBSMS website.
